What is the most efficient growing cycle?

Consider this scenario.
1 growing area
1 light
Year round growing
Access to clones

All other variables aside, what is the most efficient method for producing grade-A MMJ?
It seems to me, that the vegetative stage is more costly(18 hours vs 12).

Unless the actual number of plants came into play(due to local laws) or the cost of clones too great, wouldn't getting a couple extra grows a year compensate for the increased yield.
NFT offers some really compact growing scenarios as well.
I would also note that in my experience, clones budded early make some really nice kolas(per plant), and big vegged plants(FIM and LST included) while they have a some nice kolas too, end up with a lot of popcorn buds.
Quality should not be sacrificed in either scenario.

The best method for most people will also be the simplest for them to use. Don't set up something complex if you don't really know what you're doing. It's not hard to grow this plant, but screwing it up is even easier. The power used for 18 hours will cost a little more but will be worth it. You should only use 12 hours when flowering. If you want, maybe you could reduce veg lighting to 15 hours. Just grow in soil, is my opinion. Pick what's easy to do.